Checkboxes not allowed on JetPunk?

Basically, I am working on a quiz and I need a checkbox via HTML. Normally, you'd do something like this, just without the spaces:

< input type="checkbox" id="keycheckbox" >

< label for="keycheckbox" style="color: white; font-family:cambria; font-size:15px;" >< b >Hide Key< /b >< /label >

Well, this isn't working as when I go into preview mode, the whole first line is deleted. Is there a way around this or a method which has the same function which doesn't utilise checkboxes in this way?

Thanks